首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
"Environmental Science Class" In the lecture, the professor identifies several problems associated with wind power. Indicate wh
"Environmental Science Class" In the lecture, the professor identifies several problems associated with wind power. Indicate wh
admin
2012-01-14
63
问题
"Environmental Science Class"
In the lecture, the professor identifies several problems associated with wind power. Indicate whether each of the following is one of the problems mentioned. Click in the correct box for each phrase.
[Narrator] Listen to part of a lecture in an environmental science class. The professor is talking about
wind power.
[Professor]
Today I want to talk with you about another renewable source of energy... wind power. This isn’t a new Q6
concept. In fact, wind has been used for centuries to pump water and launch sailing vessels. But more
recently, wind power has been used to generate electricity.
By the year 2000, California was using, maybe 15,000 wind turbines to produce about 400
megawatts of electricity. And that was happening at a cost that would be considered competitive with
coal or nuclear power. And, although California currently leads the United States in harnessing wind
power, there are several other areas that also hold considerable potential for increased production.
Texas and the Dakotas alone have enough wind potential to power the nation, but, since the winds
there are so variable, well, wind power alone would be unreliable as a primary source of continuous
energy. Nevertheless, it could be used as a secondary resource, along with fossil fuels. The strong and Q7
steady winds of the Pacific Northwest, especially in the Columbia River Basin... these winds would be
ideal as a supplement to hydroelectric power when the river is experiencing periods of low water levels.
Studies by the U.S. Department of Energy indicate that wind power generated from the Great Plains in
the middle of the country could supply the continental United States with almost... 75 percent of the
electricity required for the region.
In another section of the same report, it was noted that wind power is the world’s fastest growing
energy source. Since 1998, the capacity for wind energy has increased by more than 35 percent worldwide.
And improvements in wind turbine technology in the past couple of decades has improved efficiency,
cutting the cost dramatically, from roughly 40 cents to about 4 cents per kilowatt hour, and a new
turbine design is being tested with a lower torque, so that may actually move the price closer to 3 cents.
Europe currently accounts for ever 17... , Oh, sorry that’s 70... seven-zero percent of the world’s Q8
wind power. India, China, Germany, Denmark, Italy, and Spain have published plans for major
increases in wind-generated electricity projects in the next few years, and recent interest and exploration
have been initiated in the United Kingdom and Brazil. Remote areas, especially islands, and other
regions at a distance from electrical grids are vigorously exploring wind options. Clearly, the global
implications not only for cheap energy but also for clean energy could be enormous. And, in some
areas, the consumers are even willing to pay a subsidy for the pollution-free energy that wind provides
their communities. In Colorado, for instance, through a program called wind source, about 10,000 customers
pay an additional $2.50 per month for every 100-killowatt hours of wind power. Legislation in
several states in the United States now requires utility companies to guarantee that a percentage of
their electricity will be generated from renewable sources like wind power.
Of course, there are some problems associated with wind power that do need to be considered. The Q9
blades on the turbines present a hazard to migrating birds.In some cases, the vibrations interfere with
television reception in the area. And, there have been objections to wind farms because. they produce
noise and because they’re not visually appealing to residents nearby. So, in addition to the studies to
improve turbine design and energy efficiency, some of the attendant problems also require research
and development. Regarding the noise, let me mention that design modifications, basically modifying
the thickness of the turbine blades and making adjustments to the orientation of the turbines... these
modifications have diminished the noise substantially in a number of sites. As for visual appeal, some
creative ways to share the land to create a more attractive wind farm are being piloted.
So that brings us to the issue of storing wind power. And, although wind energy can be stored temporarily
as battery power, the real challenge for wind power exploration will be how to level out the
energy source. Alternatives for storage will be critical because, even in an area with steady winds, wind
is still not totally reliable. But, the Tellus Institute has released promising results from studies to investigate Q10
the problem of intermittent wind. This is what they did. By dividing the wind turbines from one farm
into two smaller farms with geographical separation. the capacity of the pair of farms increased by
percent over the efficiency of the larger farm with the same number of turbines. So by taking advantage
of the slightly different wind patterns, a more continuous supply of wind power can be generated.
So where are we with all of this? Well, the research that will make wind power a viable option is Q11
underway but We need to continue to study... in Order to solve some of the problems... before we
can use wind Dower as a primary source of energy, globally
选项
答案
Yes No A Poor television reception √ B Noisy turbines √ C Expensive operating costs √ D Remote areas √ E Dangerous blades for birds √
解析
In the lecture, the professor identifies several problems associated with wind power.
Indicate whether each of the following is one of the problems mentioned. Click in the correct box for each phrase.
转载请注明原文地址:https://kaotiyun.com/show/9PyO777K
0
托福(TOEFL)
相关试题推荐
Youshouldspendabout20minutesonQuestions27-40,whicharebasedonReadingPassage3below.Isthe
Youshouldspendabout20minutesonQuestions27-40,whicharebasedonReadingPassage3below.Isthe
AncientPeopleinSaharaOnOct.13,2000,PaulSereno,aprofessorfromtheUniversityofChicago,guidedateamofpalaeon
ElephantCommunicationO’Connell-Rodwell,apostdoctoralfellowatStanfordUniversity,hastravelledtoNamibia’sfirst-ev
Bestcom—ConsiderateComputing’Yourbatteryisnowfullycharged,’announcedthelaptoptoitsownerDonaldA.Normaninas
TheStudyofChimpanzeeCultureA.Afterstudyingthesimilaritiesbetweenchimpanzeesandhumansforyears,researchershav
CompanyInnovationA.InashabbyofficeindowntownManhattan,agroupof30AI(artificialintelligence)programmersfrom
MartinaBila’sappointmentwiththeaccommodationofficerisat______.WhatwillMartinalose?
Theprofessorsaysthatsuperhighways______.【28】
TheprofessoralreadyknowssomethingaboutClarefromher______.
随机试题
女,36岁,近5年反复痰中带血或大咯血。轻咳,为少量黏液痰,无低热。胸片示:左下肺纹理增粗、紊乱呈卷发样,余未见异常。首先应考虑
A.虚热证B.肝经有热C.心火上炎D.外感风热初期E.实热证舌体小,舌色鲜红而少苔,或有裂纹,或红光无苔的临床意义是
背景资料:某工程公司项目部承担煤码头翻车机房施工。翻车机房基坑土方开挖工程完工后,基坑周围未按施工组织设计安装防护栏杆,也未设明显的安全警示标志。该项目部一名技术员按照项目经理的安排,骑自行车到煤码头工地联系工作,路过基坑时,不慎连人带车一起滑入坑内。所幸
(2010年)以下哪一项所判全部为气象要素?
某起重运输设备安装工程项目,承包方为了满足施工要求,针对其专业技术要求编制了两个施工方案,施工方案编制完成后,组织了相关人员对其进行了技术经济分析和比较,经过对其进行技术经济分析和比较后,确定了其中一个施工方案为本工程项目的优选施工方案。起重运输设
关于招标程序和要求的说法,正确的是()。
华晨公司2010年4月固定资产有关资料如下:(1)7日,购入不需安装的生产设备,共支付款项19.539万元;取得的运输发票注明:运杂费0.461万元。款项均以银行存款付讫。(2)12日,尚在安装中的某生产线领用原材料的实际成本为0.6万元。(3)21
材料:“鸟适于飞行的形态结构特点"的教学片段1.联系生活实践。提问:在生活中你见过哪些能飞的物体?2.引导学生回顾生活中的场景:纸飞机、氢气球、蒲公英等。提问:这些物体为什么能飞?它们具备哪些飞行的条件?3.播放鸟飞行的视频。提问:鸟为什么能飞行?
下列句子中,“于”的意义和用法不同于其他三项的是()。
技能学习最基本的条件是讲解。()
最新回复
(
0
)